Because Enhanced Intel SpeedStep technology (EIST) can be disabled by power settings within the Windows operating system, you should make sure that the chosen power settings aren't prohibiting the technology from dynamically altering the processor core frequencies.

This page will guide you through the process to ensure that the Windows power plan settings aren't stopping EIST from working.

Please note that this guide already assumes that you've downloaded the portable version of Piriform Speccy from the Internet, and that you have it running. The portable version doesn't require installation, and the download is 100% free.

You can get to the power settings within Windows, by right-clicking on the battery icon in the taskbar's icon tray. Alternatively, you can right-click on the Start Menu and click the Power Options option towards the top of the context menu that appears. This applies for all versions of Windows Vista, Windows 7, Windows 8, Windows 8.1, and Windows 10.

The example screenshot above was taken from within Windows 10.

Next, you'll want to click on the Change plan settings option next to whichever power plan your laptop is currently using (it will be shown in bold).

The setting you want isn't displayed in the simplified settings menu, so you'll therefore need to click the Change advanced power settings option.

You should now see a settings menu appear like that of the screenshot above. Scroll down to Processor power management and click on the little plus icon to expand the category's settings. Click on the plus once again for the Minimum processor state setting to display an input field.

If the percentage in the input field shown is set below 100%, and the processor core table shown in Speccy indicates that the core frequencies aren't dynamically changing, you can safely assume that EIST isn't supported by your laptop. Alternatively, if the frequencies are changing, EIST is enabled and working.